Um, if you get corydoras I would really suggest getting the hasborsus, pygmaeus, or hastatus. They're all smaller corydoras that would love a 10g tank, especially a planted one! If you don't get one of those kinds I would suggest only the juliis or pandas for your tank. Those get around 2", they'd be a little cramped but nothing compared to a 3-4" beast corydora! Just a little more information